[T]he Buddha of Many Treasures attested to the truth of the Lotus Sūtra (in the “Beholding the Stupa of Treasures” chapter), and the numerous Buddhas in manifestation coming from all the worlds in the universe verified the truthfulness of the sūtra by extending their long tongues to reach the Brahma Heaven (in the “Divine Powers of Buddhas” chapter). Thus the “three” Buddhas of Śākyamuni, the Buddha of Many Treasures, and the numerous Buddhas in manifestation verify the truth of the Lotus Sūtra. Therefore, we can say that while the Lotus Sūtra is one book, it is worth three books, its one phrase is worthy of three phrases, and one word is worthy of three words. That is to say, one written Chinese character in the Lotus Sūtra is equipped with the merits of these “three” Buddhas; it is like a wish-fulfilling gem.
Shijō Kingo-dono Gohenji, Response to Lord Shijō Kingo